In an email sent out to Deliveroo drivers on Tuesday, chief executive Will Shu said they should not work in areas that they feel are unsafe, and told workers to report safety concerns to the company and police.

The British Takeaway Campaign, led by food delivery company Just Eat and representing various groups in the industry, said there needed to be stronger rules to protect drivers.

Chairman of the British Takeaway Campaign, Ibrahim Dogus, said: "We call upon the Metropolitan Police to do everything in its powers to prevent further attacks, including restricting the sales of strong acid, and bring those carrying out these attacks to justice."

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